1.定义一个记录光标底部的成员变量cursorBottom

2.监听键盘出现和键盘消失通知（记得在dealloc方法中 移除监听器）

3.在UITextField的代理方法textFieldShouldBeginEditing：中转换当前输入框的原点坐标到scrollView中的坐标，计算光标底部坐标并保存

4.在监听键盘出现执行方法中计算 需不需要滚动及滚动大小，动画实现滚动

5.在监听键盘消失方法和点击空白处方法，关闭键盘

主要实现代码如下：

@interface AddAccountViewController ()<UITextFieldDelegate>

@property (nonatomic, assign) CGFloat  cursorBottom;

@end

@implementation AddAccountViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    self.scrollView = [[UIScrollView alloc] initWithFrame:self.view.bounds];

    self.scrollView.backgroundColor = self.view.backgroundColor;

    [self.scrollView addGestureRecognizer:[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(hiddenKeyboard)]];

    [self.view addSubview:self.scrollView];

    //注册键盘出现的通知

    [[NSNotificationCenter defaultCenter] addObserver:self

                                             selector:@selector(keyboardWillShow:)

                                                 name:UIKeyboardWillShowNotification object:nil];

    //注册键盘消失的通知

    [[NSNotificationCenter defaultCenter] addObserver:self

                                             selector:@selector(keyboardWillHide:)

                                                 name:UIKeyboardWillHideNotification object:nil];

    [self setupAccountInfo];

}

- (void)dealloc

{

    [[NSNotificationCenter defaultCenter] removeObserver:self];

}

#pragma mark UITextFieldDelegate

-(BOOL)textFieldShouldBeginEditing:(UITextField *)textField

{

    CGPoint point = [textField convertPoint:CGPointMake(0, 0) toView:_scrollView];

   self.cursorBottom = textField.height+point.y ;

    return YES;

}

#pragma mark 键盘代理事件

///键盘显示事件

- (void) keyboardWillShow:(NSNotification *)notification {

    //获取键盘高度，在不同设备上，以及中英文下是不同的

    CGFloat kbHeight = [[notification.userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size.height;

    //计算出键盘顶端到inputTextView panel底端的距离(加上自定义的缓冲距离INTERVAL_KEYBOARD)

    CGFloat offset =  self.cursorBottom + kbHeight - self.view.height;

    // 取得键盘的动画时间，这样可以在视图上移的时候更连贯

    double duration = [[notification.userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];

    //将视图上移计算好的偏移

    if(offset > 0) {

        [UIView animateWithDuration:duration animations:^{

            self.scrollView.contentOffset = CGPointMake(0, offset);

        }];

    }

}

///键盘消失事件

- (void) keyboardWillHide:(NSNotification *)notify {

    // 键盘动画时间

    double duration = [[notify.userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];

    //视图下沉恢复原状

    [UIView animateWithDuration:duration animations:^{

        self.scrollView.contentOffset = CGPointMake(0, 0);

    }];

}

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event

{

    [self.view endEditing:YES];

}

- (void)hiddenKeyboard

{

    [self.view endEditing:YES];

}

@end

键盘遮挡输入框处理